Electric lamp



May 1945' G SINGER ELECT LAMP File May 1943 a 3% WW Mylflaww v I W Patented May 1, 1945 UNITED STATES PATENT OFFICE ELECTRIC LAMP Grover C. Singer, Brownsville, Tex. Application May 13, 1943, Serial no. 486,873

11 Claims.

This invention relates to electric lamps.

An object of the invention is the provision of an electric lamp in which the base portion is formed integrally with the globe, the construction being such that the filaments may be readily removed and replaced when desired.

Another object of the invention is the provision of an electric lamp in which the base portion and globe are formed integrally with each other and preferably made of translucent or transparen material, with a passage in the base portion through which supports for filaments may be inserted or withdrawn by a suitable tool, and in which the supports may or may not be removably.

connected to the inner projecting ends of contacts which are adapted .to be connected with the usual house current for energizing the filaments.

A further object of the invention is the provision of a lamp bulb in which the base portion carrying the usual contacts for completing a circuit through the filaments of the bulb is provided with a longitudinal passage for the insertion or removal of filaments and their supports, which may or may not be removably connected to the inner projecting ends of said contacts, said supports being formed of resilient material, so that the support can be compressed when inserted through the passage, or said supports being formed of insulated material and small enough to be inserted through the passage, said passage being closed after the air is exhausted from the bulb.

This invention will be best understood from a consideration of the following detaileddescription, in view of the accompanying drawing forming a part of the specification; nevertheless, it is to be understood that the invention is not confined to the disclosure, being susceptible of such changes and modifications as define no material departure from the salient features of the invention as expressed in the, appended claims.

In the drawing:

Fig. 1 is a horizontal section through the bulb of an electric lamp constructed according to the principles of my invention.

Fig. 2 is a vertical section of the lamp, taken along the line 2-2 of Fig. 1.

Fig. 3 is a fragmentary enlarged section showing one form of removable support for a filament employed in Figs. 1 and 2.

Fig. 4 is a vertical section of an electric lamp showing another form of the filament support.

Fig. 5 is a fragmentary vertical section of a passage in the base portion of the form illustrated in Fig. 4 showing a filament support being inserted through said passage.

Fig. 6 is an enlarged fragmentary vertical section of the lamp illustrated in Figs. 4 and 5, showing the modified form of support in operative position.

Fig. 7 is a horizontal section taken along the lines 1-! of Fig. 6.

Referring more particularly to the drawing Ill designates a base member which may be formed of glass and from which rises in integral formation a bulb H from which the air is exhausted, and which houses the filaments and their supports. The bottom wall I2 of the bulb H is curved to provide a concave surface for the inner end of the base member ID, and this concave surface is substantially covered with a reflecting material, as shown at l3. The method of applying this material is described in my co-pending application, Serial #461,978, filed October 14, 1942. However, a brief description of this method will be set forth.

It will also be noted that the reflecting surface l3 extends upwardly for a short distance along the inner side walls of the bulb l I, as shown at H.

Filaments 20 and 2| of. the usual type are laced in semi-circles at diametrically opposite points within the bulb II, and are supported above the bottom of the bulb or above the inner face of the base portion In by a plurality of connectors, generally designated by the numerals 22, 23 and 24. As shown more particularly in Fig. 3, each connector consists of a conically shaped member 25, which is formed of glass or other insulating material, or these conically shaped members may be formed of metal with the base portion 26 of each member being seated upon the inner surface [2 of the base portion III. A metal cap 21 is secured in any approved manner to the top or inner reduced end of each connector. Depending from each cap is a pin or rod 28, which is located within the conically shaped member 25. A post 29 extends upwardly or outwardly from the cap 21 and is either split at its end or perforated to receive a straight portion 30 of the filament 20* or 2l., Where the post 29 is split the split ends are forced together so they will clamp upon the wire 30 for retaining the filament at this point in position. i

The connector or support 23 shown in Figs, 1 and 3 may or may not have electrical connections with the circuits. This connector may merely act as a support for the intermediate portion of the filament 20 or 2|. In view of this a wire 3| is embedded in the material of the base portion l8, and this wire extends outwardly from the base portion and into the bulb The inner end of the wire may be split or it may be formed connected to a contact member 34 formed at the outer end 35 of the base portion l8. The posts 28 of the two connectors 22 and 24 receive the free ends of the filament 2| located on one-half of the bottom wall l2, while the post 28 of the connector or support 23 receives the intermediate ing member 28 will frictionally receive the split portion 38 of said filament. On the other hand,

the filament 28 is similarly supported by the posts 28 of the respective connectors 22, 23 and 24 on the other half of wall [2.

The connector 24 is identical in construction with the connectors 22 and 23 but the depending member 28 of this connector'receives the inner end of a wire 38, while the outer end of said wire extends through the base portion l8, and is connected with the threaded metal sleeve 31, which forms the other contact of the circuit.

It will be noted vthat'the filament 2| and its supports and electric connectors have been described so that a complete circuit through the filament 2| is had by the contact wire 33 and the electric connections between the post 29 of the member 22 and the post on the connector or support 24, thence through the wire 36 to the metal sleeve 31. Since the same construction is employed for supporting the filament 28 for providing electrical connections with a socket which receives the threaded sleeve 31 the same reference numerals are therefore applied to similarly disposed elements in the arrangement associated have electrical connections with the circuit, since the outer end of the wire 3| may terminate at the base portion l8 and have no electrical contact. In that event it will merely act as a support to maintain the filaments in the form of an are, as shown in Fig. 1, so that the filaments 28 and 2| will spread over a wide area within the globe However, it may end in a contact 34 as does the wire 38.

It will be noted from Figs. 2 and 3 that those portions of the inner surface of the base portion I8 where the wires 8|. 33 and 38, project into the globe II, are free of the reflecting surface la in order to prevent short circuiting of the filaments.

In order to prevent the reflecting surface from adhering to these portions, such portions are given a coating of melted wax by inserting an instrument through the ion itudinal passage 48 formed in the base portion i8 with the passage extending from the outer end and throughthe outer end 35 of the base portion into the chamber within the globe After the inner surface of the base portion has been treated with a reflecting material as shown at l2 and I4, the wax may be removed by a'suitable solvent which will not aflect the reflecting surface, as described in my co-pending application, Serial No. 461,978, filed October 14, 1942.

The passage 48 has a diameter sufliciently great for passing the supports 22, 28 and 24 through the same by means of a suitable tool, after which.

they are forced downwardly so that the dependend or tubular end 82 of the wires 8|, 88 and 88.

After these members are in place the filaments 28 and 2| are then positioned by a suitable tool on the post ,28, and the'split posts are then pressed together on the ends and intermediate portions of the filaments 28 and 2| for securely dered aluminum and 40 parts of distilled water.

It may be necessary to slightly reconstruct the usual socket for receiving this type of lamp in view of the fact that two contact points 84 are employed on the outer end 35 of the base portion l8. 0n the other hand, if desired, the two wires 33 may be brought together and joined with a single contact member 34.

The construction shown in Figs. 4 to "l inclusive is slightly modified and instead of the conically shaped support 25'being formed of glass or other insulating material resilient metal legs support the metal cap portion 46. The post 28, however, is substantially the same as the post 29 in Figs. 1 to 3 inclusive, and this post has a split portion as shown at 41 to receive an end of a portion of the filament 28 or 2| as the case may be.

Another modification in this construction is shown in the tubular member 48 which receives the inner end of a wire 33 so that when the tubular member 48 is forced downwardly over the corrugated end 48 of the wire 33. the support generally designated by the numeral 58 is held in place. The tubular member is provided with an opening 5| through which may be inserted a welding tool for welding a portion 52 of the corrugated portion 49 of the wire 33 to the tube in order to securely attach the support 58 to' its respective wire 3|. 33 or 38 as the case may be.

The base portion l8 in Figs. 4 to 7 inclusive has a central passage 48 through which the supports 22, 23 and 24 are inserted. Since the legs 45 of the support are formed of spring material they will be compressed when they are forced through the passage 48. All the other elements of the lamp in themodified form are substantially the same as those employed in Figs. 1 to 3 inclusive, and therefore no further description will be required.

I claim:

1. A lamp having a base portion formed integrally with a globe, said base portion having a longitudinal passage connecting the interior of the globe with the outside, said base portion having at least a pair of lead wires extending through the base portion and projecting into the globe, a detachable filament connector mounted on the inner projecting end of each lead wire and a filament attached between the connectors.

2. A lamp having a base portion and a globe rising therefrom, said base portion having a longitudinal passage connectingthe interior of the globe with the exterior, said base portion having at least a pair of lead wires extending through the base portion with the inner ends thereof projecting into the interior of the globe, a detachable filament connector mounted on the inner end of each wire and having a width less than the diameter of the passage so that said connector may be inserted through the passage, each connector including a head provided with means attaching one end of a filament to the head, a pair of legs formed of spring material, and mean depending from the head for neatly receiving the inner end of the adjacent wire.

3. A lamp having a base portion and a globe rising therefrom, said base portion having a longitudinal passage connecting the interior of the bulb with the exterior, said base portion having at least a pair of. lead wires embedded therein with one end projecting into the globe, a detachable filament connector mounted on the inner end of each wire, each connector including a head having means thereon securing one-end of a filament to the head, supporting legs projecting from said head and movable toward each other when inserted through the passage and the interior of the globe and at least a pair of lead wires embedded in said base portion, one end of each wire projecting into the interior of the globe, a filament connector associated with each wire, each connector being cone-shaped and havconnector to the associated lead wire.

8. A lamp having a base portion and a globe rising therefrom, said base portion having 9. Iongitudinal passage connecting the interior of the bulb with the exterior, said base portion having at least a pair of lead wires embedded therein having means thereon for securing one end of a v with one end projecting into the globe, a pair of filament connectors inserted through the passage and detachably connected to. the inner ends of the lead wires, each connector including a head filament to the head, said free end of each lead wire being angularly and serially bent, said connector having a depending tube frictionally re ceiving the bent portion of said lead wire for attaching the connector to said contact and ing means at the smaller end connected to an end of a filament, the opposite end of the conthe globe, a filament connector associated with 4 each wire, each connector being cone-shaped and having means at the smaller end connected to an end 01' a filament, the opposite end of the connector being seated on the inner surface of the base member, and a projection depending from the smaller end, within the cone-shaped connector, and attached to the free inner end of the adjacent lead wire.

6. In a lamp, a base portion from which rises an integrally formed glass globe, said base-por tion having a longitudinal passage opening into the interior of the globe and at least a pair of lead wires embedded in said base portion, one end of each wire projecting into the interior of the globe, a filament connector associated with each wire, each connector being cone-shaped and :0 gitudinal passage connecting theinterior of the means supporting the head and tube outwardly of the inner surface of-the base portion.

9. A lamp having a base portion and a globe rising therefrom, said base portion having a lonbulb with the exterior, said base portion having at least a pair of lead wires embedded therein with one end projecting into the globe, a p ir of filament connectors inserted through the passage and detachably connected to the iimer ends of the lead wires, each connector including a head having means thereonsecuring one end of a filament to the head, said free end of each wire being angularly and serially bent, a tube depend- 0 ing from the head and frictionally receiving the bent free end of the wire, and legs formed of resilient material extending from the head and supporting the head and tube outwardly from the inner end of the base portion. 10. A lamp having a base portion formed of insulating material and a bulb, lead wires embeddedin said base portion with 'free ends projecting into the interior of the bulb, filament supports attached to the free ends and a filament having-the ends thereof connected between a pair 01" the'supports and so arranged as to form substantially a semi-circle, said lead wires adapted to be connected with a source 01 current, said supports having means electrically connecting having means at the smaller end connected to an end of a filament, .the opposite end of the connector being seated on the inner surface of the base member, and a projection depending from the smaller end, and attached to the free inner end of the adjacent lead wire, said cone-shaped connector being formed of insulating material.-

, 7. A lamp having a base portion-and a globe *rlsing-therei'rom, said base portion having a lon- 65 gitudinal passage connecting the interior of the the filaments with the lead wires.

11. A lamp having a base portion formed oi insulating material and a bulb, lead wires embedded in said baseportion with free ends projecting into the interior of the bulb, filament supports attached to the free ends and a filament having the ends thereof connected between a pair or the supports, and an intermediate filament support so positioned relative to the pair of supports that the filament will form substaned to be connected with a source of current, said pair of supp fts having means electrically con-- necting the ends or the filament with the lead wire.-

enovna a emone.

tially a. semi-circle, said pair of lead wires adapt 

